Rebels bombarded government-held areas of Aleppo with rockets on Tuesday, killing 19 people and hitting a hospital, while also launching a ground assault on army-held positions of the divided city, the Syrian Observatory for Human Rights said.
The Syrian army said insurgents had launched a broad-based assault and that it was responding. State-run Syrian news channel Ikhbariya said three women had been killed and 17 more people wounded at the al-Dabit maternity clinic.
The army statement said the attack was at "a time when international and local efforts are being made to shore up the (cessation of hostilities agreement) and to implement ... calm in Aleppo.